package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.*;
import com.sky.websocket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.MessageDeliveryException;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WebSocketServer webSocketServer;

    private long orderid;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        // 1.处理各种业务异常（地址簿为空、购物车数据为空）前端判断了，但是如果不是通过前端下单，比如postman，就会出问题，所以后端也要判断
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            // 抛出异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList == null || shoppingCartList.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        // 2.向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);

        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);
        orders.setAddress(addressBook.getProvinceName() + addressBook.getCityName()
                + addressBook.getDistrictName() + addressBook.getDetail());

        orderMapper.insert(orders);
        orderid = orders.getId();

        // 3.向订单明细表插入N条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();

        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        // 4.清空购物车
        shoppingCartMapper.delete(shoppingCart);

        // 5.封装VO的返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {

        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        //为替代微信支付成功后的数据库订单状态更新，多定义一个方法进行修改
        Integer OrderPaidStatus = Orders.PAID; //支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单

        //发现没有将支付时间 check_out属性赋值，所以在这里更新
        LocalDateTime check_out_time = LocalDateTime.now();
        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, orderid);

        // 因为回调不了paysuccess所以要在这里提前实现
        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒，2表示用户催单
        map.put("orderId", orderid);
        map.put("content", "订单号：" + ordersPaymentDTO.getOrderNumber());

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);

        return vo;

    }

//    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
//        // 当前登录用户id
//        Long userId = BaseContext.getCurrentId();
//        User user = userMapper.getById(userId);
//
//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }
//
//        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
//        vo.setPackageStr(jsonObject.getString("package"));
//
//        return vo;
//    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过websocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒，2表示用户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 获取历史订单
     * @param page
     * @return
     */
    @Override
    @Transactional
    public PageResult getHistoryOrders(int page, int pageSize, Integer status) {
        PageHelper.startPage(page, pageSize);
        Long userId = BaseContext.getCurrentId();

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setPage(page);
        ordersPageQueryDTO.setPageSize(pageSize);
        ordersPageQueryDTO.setStatus(status);
        ordersPageQueryDTO.setUserId(userId);

        Page<Orders> ordersList = orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> list = new ArrayList<>();
        if(ordersList != null && ordersList.size() > 0) {
            for (Orders order : ordersList) {
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(order.getId());
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order, orderVO);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }

        PageResult pageResult = new PageResult(ordersList.getTotal(), list);
        return pageResult;
    }

    /**
     * 获取订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO getOrderDetail(Long id) {
        Orders order = orderMapper.getById(id);
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(order, orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        String orderDishesStr = getOrderDishesStr(order);
        orderVO.setOrderDishes(orderDishesStr);
        return orderVO;
    }

    /**
     * 取消订单
     * @param id
     */
    @Override
    public void cancel(Long id) {
        Orders orderCheck = orderMapper.getById(id);
        if(orderCheck == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        if(orderCheck.getStatus() > Orders.TO_BE_CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(id)
                .cancelTime(LocalDateTime.now())
                .cancelReason("用户取消了订单。")
                .build();

        if(orderCheck.getStatus().equals(Orders.TO_BE_CONFIRMED)){
//        // 退款逻辑
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == Orders.PAID) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

            orders.setPayStatus(Orders.REFUND);
        }

        orders.setStatus(Orders.CANCELLED);
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     * @param id
     */
    @Override
    @Transactional
    public void repeat(Long id) {

        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        shoppingCartMapper.insertBatch(shoppingCartList);

//        Orders orderBefore = orderMapper.getById(id);
//        if(orderBefore.getStatus() != Orders.COMPLETED){
//            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
//        }
//        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
//        AddressBook addressBook = addressBookMapper.getById(orderBefore.getAddressBookId());
//
//        Orders orders = new Orders();
//        orders.setAddressBookId(orderBefore.getAddressBookId());
//        orders.setPayMethod(orderBefore.getPayMethod());
//        orders.setRemark(orderBefore.getRemark());
//        orders.setOrderTime(LocalDateTime.now());
//        orders.setPayStatus(Orders.UN_PAID);
//        orders.setStatus(Orders.PENDING_PAYMENT);
//        orders.setNumber(String.valueOf(System.currentTimeMillis()));
//        orders.setPhone(addressBook.getPhone());
//        orders.setConsignee(addressBook.getConsignee());
//        orders.setUserId(BaseContext.getCurrentId());
//        orders.setAddress(addressBook.getProvinceName() + addressBook.getCityName()
//                + addressBook.getDistrictName() + addressBook.getDetail());
//
//
//        orderMapper.insert(orders);
//        Long ordersId = orders.getId();
//        for (OrderDetail orderDetail : orderDetailList) {
//            orderDetail.setOrderId(ordersId);
//        }
//
//        orderDetailMapper.insertBatch(orderDetailList);

    }

    @Override
    public PageResult list(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> orderVOList = getOrderVOList(page);
        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO getOrderStatistics() {
        Integer toBeConfirmed = orderMapper.groupByStatistics(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.groupByStatistics(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.groupByStatistics(Orders.DELIVERY_IN_PROGRESS);

        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /**
     * 接单
     * @param
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    @Override
    public void reject(OrdersRejectionDTO ordersRejectionDTO) {

        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        Integer status = ordersDB.getStatus();
        if(ordersDB == null || !status.equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(ordersRejectionDTO.getId())
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .status(Orders.CANCELLED)
                .cancelTime(LocalDateTime.now())
                .payStatus(Orders.REFUND)
                .build();

    //        // 退款逻辑
    //        Integer payStatus = ordersDB.getPayStatus();
    //        if (payStatus == Orders.PAID) {
    //            //用户已支付，需要退款
    //            String refund = weChatPayUtil.refund(
    //                    ordersDB.getNumber(),
    //                    ordersDB.getNumber(),
    //                    new BigDecimal(0.01),
    //                    new BigDecimal(0.01));
    //            log.info("申请退款：{}", refund);
    //        }

        orderMapper.update(orders);
    }

    /**
     * 商家取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());
        Integer payStatus = ordersDB.getPayStatus();
        if(payStatus == Orders.PAID){
//        // 退款逻辑
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == Orders.PAID) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
        }

        Orders orders = Orders.builder()
                .id(ordersCancelDTO.getId())
                .payStatus(Orders.REFUND)
                .cancelTime(LocalDateTime.now())
                .cancelReason(ordersCancelDTO.getCancelReason())
                .status(Orders.CANCELLED)
                .build();

        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB.getStatus() == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB.getStatus() == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /**
     * 用户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        // 先查订单是否存在
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        // 向客户端浏览器推送消息
        Map map = new HashMap();
        map.put("type", 2); // 1表示来单提醒，2表示用户催单
        map.put("orderId", id);
        map.put("content", "订单号：" + ordersDB.getNumber());
        String json = JSON.toJSONString(map);

        webSocketServer.sendToAllClient(json);
    }

    /**
     * 将Orders转化为OrderVO，因为有些状态需要一个额外的输出参数：菜品信息
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> orders = page.getResult();
        if(!orders.isEmpty()) {
            for (Orders order : orders) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order, orderVO);
                String orderDishes = getOrderDishesStr(order);
                orderVO.setOrderDishes(orderDishes);

                orderVOList.add(orderVO);
            }
        }

        return orderVOList;
    }

    /**
     * 将菜品信息转为字符串
     * @param order
     * @return
     */
    private String getOrderDishesStr(Orders order) {
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(order.getId());
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish;
            if(x.getDishFlavor() != null) {
                orderDish = x.getName() + "×" + x.getNumber() + " " + x.getDishFlavor() + ";";
            }else{
                orderDish = x.getName() + "×" + x.getNumber() + ";";
            }

            return orderDish;
        }).collect(Collectors.toList());

        return String.join("", orderDishList);
    }

}
